Why is memcpy performance from heap to shared memory so poor?
I tested memcpy performance from heap to heap and from heap to shared memory ([shm_open](https://www.man7.org/linux/man-pages/man3/shm_open.3.html). The test codes are as follows:
I tested memcpy performance from heap to heap and from heap to shared memory ([shm_open](https://www.man7.org/linux/man-pages/man3/shm_open.3.html). The test codes are as follows: